Solutions for navigating

[azreark1]

you can learn all about course, speed, and bearings and all of that from just about any game these days but what i want to know is the solution for things like how fast is a "Knot", and for things like being in a sub the solution for figuring out when to turn where you put together your speed and distance to target to get a time amount of when to turn like in "Hunt for the Red October" when they are running the channel. anyways just wondering.

Devon H

[Perilscope]

Originally Posted by azreark1

...how fast is a "Knot"...

For that:
http://en.wikipedia.org/wiki/Knot_%28speed%29

[Kapitan]

I use charts print outs when navigating in dangerous waters under ice on my own, i can look at my print out and predict where a boomer might be alot easier than the on screen display cause i can use dry wipe to mark on the laminate.

But navigating using speed i always use the 6 min rule which is this.

Take a speed of something multiply by 200 and thats how far its gone in 6 mins.

My ship is doing 10 knots multiply by 200 gives me 2,000 yards so in 60 minuets i will have travelled 20,000 yards or 20 miles.

Thats in a straight line but if your searching for polyna it becomes a little more complicated.

[azreark1]

anything a little more accurate?

[DAB]

http://www.paulwasserman.net/SHIII/

The tutorial is for Silent Hunter III - but the principle is the same for modern submarine warfare, its just a computer does more of the work.

However, even here the tutorial lists shortcomings in the game to take shortcuts. (eg, the 3m 15secs to calculate speed). You will need to teach yourself to convert KM into NM in order to bypass that one.

DAB

PS. I haven't listed what the forumlas for calculating, just in case you want to do them yourself. But I can, if you want?

[Linton]

Kap ,have a look again at your maths 20000yds=10nautical miles approximately.To be precise a nautical mile =6072 feet or 2024 yards.One nautical mile =1.15 x a statute mile.Knots are just nautical miles per hour.One nautical mile=1.85 kilometres.
navigating in the Sonalyst sims is easy.Define waypoint and it goes there-bit like a modern airliner really!

[DAB]

Originally Posted by Linton

To be precise a nautical mile =6072 feet or 2024 yards.

One nautical mile =1.15 x a statute mile.Knots are just nautical miles per hour.One nautical mile=1.85 kilometres.

Actually, a Nautical Mile is 5852ft. It used to be 6072ft in the Royal Navy during the first and second world wars - but in the 1970's the UK adopted the International Standard.

[azreark1]

yeah DAB, list away!

[Linton]

Dab are you telling me that wikipedia is wrong?http://en.wikipedia.org/wiki/Nautical_mile
The civil aviation community still use the traditional measurement.Where is your reference to this new measurement?

[DAB]

Originally Posted by Linton

Dab are you telling me that wikipedia is wrong?http://en.wikipedia.org/wiki/Nautical_mile
The civil aviation community still use the traditional measurement.Where is your reference to this new measurement?

I've just checked wikipedia? It says 1582ft as welll? I've occasionally worked at sea and whilst I don't claim to be a navigation expert, we were definatly using the International Standard. (See the second to last paragraph of the history section of the wikipedia article.

The second bit of your original post was right in terms of convertion values, are you sure the 6080ft wasn't a typo (I sometimes use the old admiralty measurement by mistake)



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azeark1

Right well the conversion depends on the game your playing. If your playing 688I, Sub Command, or Dangerous Waters, or any game set in the time the desktop calculator existed - then to convert the values, do the following

NM to KM = x1.852
KM to NM = x0.54

That will allow you to convert the values pretty easily.

In Silent Hunter III, you don't have access to a calculator because its the size of the bedroom you grew up in. Therefore you need to create a formula like they taught you in school (or at least taught me, who says the British Education systems that bad )

To convert...


KM to NM: For every 20, subtract 1. Then take the answer and divide by nine. Take that figure and multiply by five.

NM to KM: Divde the NM by five and then multiply the answer by nine. For every 20, add 1


Now, unless your doing 60 minutes between sightings, your not going to exactly have it that easy. Your only going to see the ship travel a couple of hundred meters or thousend feet. So you have to multiply that figure up to the right value before you do the above conversions.

For example, you do two sightings on the periscope at a space of two minutes, in which time the ship has traveled 250m. Two minutes is one 30th of an hour so you have to multiply 250 by three = 750m, then by ten to get 7500. Now as a KM is 1000m we know the ship is now traveling at 7.5kmph. Divide 7.5 by nine to get 0.83 and multiply that by 5 to get 4.15knots.

follow?